I just uploaded version 1.1.1 (and edited the link at the top of this thread). t_jobe pointed out that I was getting my slashes wrong (I was using backslashes where I should have been using forward slashes in the images). The only update from 1.1 to 1.1.1 is that I now convert to the correct slashes before saving the HTML.
If you have pages already that use the wrong slashes, you can use the included stringreplace tool to swap them.
stringreplace *.html /
Tlaero